app-preview-craft-skill 是做什么的？
Creates marketing visuals for an app from its screenshots and screen recordings: App Store and Google Play screenshot sets, social and Open Graph cards, 2D screen videos, 3D device mockup images and 3D device videos (iPhone, Galaxy, MacBook). Renders locally with headless Chrome, three.js, sharp and ffmpeg; 40 themes, every property configurable, plus a live preview studio. Use when the user wants app store or play store screenshots, an app preview or promo video, a phone or device mockup, a 3D